Drill tip and drilling tool having a drill tip

Abstract

The invention relates to a drill tip ( 2 ) comprising a base body ( 6 ) having chip flutes ( 22 A,B) and extending in the axial direction along an axis of rotation ( 8 ) and having at least two main cutting edges ( 14 A,B) on the front face thereof extending outward in the radial direction to a cutting corner ( 16 A,B). Seen in cross section, the base body is asymmetric relative to rotation about the axis of rotation ( 8 ) at the height of the cutting corner ( 16 A,B). The cross section of the base body is simultaneously designed having symmetrical spacing from the main cutting edges ( 14 A,B). The drill tip ( 2 ) is in particular designed as an interchangeable modular part of a modularly designed drill tip ( 5 ). A drill base body ( 4 ) in which the drill tip ( 2 ) can be inserted can therefore in turn be designed symmetrically.

The invention claimed is: 
     
       1. A drill tip comprising:
 a body provided with chip flutes and extending in the axial direction along an axis of rotation and at the front outside end of which there is provided a chisel edge which crosses the axis of rotation and transitions into at least two main cutting edges that each run outwards in the radial direction to a respective cutting corner disposed at a level with respect to the axis of rotation, 
 wherein the body, as viewed in a cross-section, has an asymmetrical configuration at the level of the cutting corners relative to a rotation about the axis of rotation, 
 wherein at a distance from the cutting corners in the axial direction, the body has a symmetrical configuration, and 
 wherein secondary cutting edges extending in the axial direction begin at the respective cutting corners, and wherein the respective cutting corners are not uniformly distributed around the periphery and, at a distance from the cutting corners in the axial direction, the secondary cutting edges are disposed with a uniform distribution; 
 wherein, at the level of the cutting corners:
 the chip flutes are realized asymmetrically in relation to one another; and 
 the chip flutes have equal cross-sectional areas. 
 
 
     
     
       2. The drill tip as claimed in  claim 1 , wherein in a transition region from the symmetrical to the asymmetrical configuration, the secondary cutting edges assume different inclinations relative to the axis of rotation. 
     
     
       3. The drill tip as claimed in  claim 1 , wherein, at a distance from the cutting corners in the axial direction, the chip flutes are realized symmetrically in relation to one another. 
     
     
       4. The drill tip as claimed in  claim 3 , wherein:
 along the axial direction, and in a transition region, the chip flutes undergo a transition from an asymmetrical configuration at the level of the cutting corners to a symmetrical configuration at the distance from the cutting corners; and 
 where the chip flutes are realized asymmetrically in relation to one another in the transition region, the chip flutes have equal cross-sectional areas. 
 
     
     
       5. The drill tip as claimed in  claim 1 , wherein adjoining the main cutting edges there are main flanks that each comprise a back end, the back ends having the same angular distance in relation to one another. 
     
     
       6. The drill tip as claimed  claim 1 , wherein the asymmetrical configuration undergoes a transition into the symmetrical configuration in a continuous and even manner. 
     
     
       7. The drill tip as claimed in  claim 1 , wherein the drill tip is realized as an exchangeable modular part provided for insertion in a drill body of a modular drilling tool. 
     
     
       8. The drill tip as claimed in  claim 7 , wherein the drill tip comprises a rear outside face, and the symmetrical configuration is present at the level of the rear outside face. 
     
     
       9. A drilling tool having a drill tip as claimed in  claim 1 . 
     
     
       10. The drilling tool as claimed in  claim 9 , wherein the drilling tool comprises a modular drilling tool having a drill body including a receiver therein in which the drill tip can be exchangeably inserted. 
     
     
       11. The drilling tool as claimed in  claim 10 , wherein the drill body is realized symmetrically in the region of the receiver. 
     
     
       12. A drill tip comprising:
 a body provided with chip flutes and extending in the axial direction along an axis of rotation and at the front outside end of which there is provided a chisel edge which crosses the axis of rotation and transitions into at least two main cutting edges that each run outwards in the radial direction to a respective cutting corner disposed at a level with respect to the axis of rotation, 
 wherein the body, as viewed in a cross-section, has an asymmetrical configuration at the level of the cutting corners relative to a rotation about the axis of rotation, 
 wherein at a distance from the cutting corners in the axial direction, the body has a symmetrical configuration, and 
 wherein, at the level of the cutting corners:
 the chip flutes are realized asymmetrically in relation to one another; and 
 the chip flutes have equal cross-sectional areas. 
 
 
     
     
       13. The drill tip as claimed in  claim 12 , wherein, at a distance from the cutting corners in the axial direction, the chip flutes are realized symmetrically in relation to one another. 
     
     
       14. The drill tip as claimed in  claim 13 , wherein:
 along the axial direction, and in a transition region, the chip flutes undergo a transition from an asymmetrical configuration at the level of the cutting corners to a symmetrical configuration at the distance from the cutting corners; and 
 where the chip flutes are realized asymmetrically in relation to one another in the transition region, the chip flutes have equal cross-sectional areas. 
 
     
     
       15. The drill tip as claimed in  claim 12 , wherein secondary cutting edges extending in the axial direction begin at the respective cutting corners, and wherein the respective cutting corners are not uniformly distributed around the periphery. 
     
     
       16. The drill tip as claimed in  claim 15 , wherein, at a distance from the cutting corners in the axial direction, the chip flutes are realized symmetrically in relation to one another.